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CVE-2026-28405

MarkUs: Stored XSS in Submission HTML Preview Enables Instructor-Context Actions

CVSS 8 HIGHEPSS 0.2%CWE-79
MarkUs is a web application for the submission and grading of student assignments. Prior to version 2.9.1, the courses/<:course_id>/assignments/<:assignment_id>/submissions/html_content route reads the contents of a student-submitted file and renders them without sanitization. This issue has been patched in version 2.9.1.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Produtos afetados
MarkUsProject · Markus

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Referências
https://github.com/MarkUsProject/Markus/commit/55d74f2ddb72d2ec2f29aa2b4cb6b2da10755036https://github.com/MarkUsProject/Markus/releases/tag/v2.9.1https://github.com/MarkUsProject/Markus/security/advisories/GHSA-p5pc-pxrj-3893